Chamfering tool



Oct. 24, 1933. w H. Es 1,931,627

CHAMFERING TOOL Filed June 1, 1928 I N V EN TOR. Mum/w HE/fMA/V W55,

ATTORNEY.

Patented Get. 24, 1933 rarer OFFICE 1,931,627 CHAMFERINGTOOL William Herman Thies, Silver Spring, Md. Application June 1, 1928. Serial No. 282,237

3 Claims. (Cl. 82- 1) My invention relates to a chamfering tool for chamfering' the end of circular stock, the tool being characterized as especially adapted'for use in trueing the ends of pipe sections by removing the bur' and roughened portions occasioned by cutting operations or rough handling. As is well known by thoseskilled in'the art, the cutting of pipe, particularly of comparatively large diameters, leaves a very pronounced bur on the outside and inside of the pipe at the ends of the cut pipe sections. The presence of an outside bur occasions great difficulty in starting the threading operation, and the general practice heretofore'has entailed considerable loss of time by labor consumed in filing the bur from pipes preparatory to forming screw threads thereon.-

One of the objects of this invention is to provide a practical tool for removing the bur and for chamfering the outside of a pipe.

A further object of this invention isto provide a sturdy structure of a minimum number of parts easy to assemble and inexpensive to manufacture.

A further object of the invention is the provision of a single tool capable of use in connection with various sizes of stock.

A. further object is to provide a tool arranged for either power operation or hand operation in which the driving power is applied to a heavy frame support, the cutters being rigidly connected thereto throughout their length.

The objects of my invention will be best understood from the following description and exemplification of my'invention, reference being had to the accompanying drawing in which:

Figure 1 is a top plan view of an embodiment of the invention.

Figure 2 is an elevational view of the device.

Figure 3 is a vertical cross sectional view showing the cooperation of the cutters with the supporting frame and driving member, the view being taken on line 3-3 of Figure 2.

Figure l is a bottom plan View of the driving connection element.

Figure is a fragmentary sectional view showing the structural arrangement of the driving member cap and frame assembly.

, Referring now to the drawing, the device comprises a cutter holding spider frame 1, the frame comprising an upper annular portion 2, a lower annular portion 3, considerably larger in diameter than the upper portion, and three arms or webs 4 spacing the annular portions. The web portions of the frame are centered at points 120 around the structure. The frame is preferably formed as an integral metal casting heavy and rugged to withstand the hard use to which a tool of this character is subjected and to provide a device of strength and one which can be manufactured at a minimum cost. The arm or web portions of the frame are slotted at 5 and a groove 6 extends through the lower annular part of the frame communicating with the arm slots. The upper annular frame section is drilled and tapped radially at points separated 120 and midway between the web connection therewith.

A combined driving connection and cutter holding means comprises a circular metal memher 8 which is provided centrally with a projecting hub 9 arranged for engagement with either a hand operated or a power operated con- 'nection. The form of the hub may obviously be suited to any particular connection and is not limited to the formation as shown by the drawing. In the particular form shown a square section 10 is provided for connection with either a hand operated or a power operated device and, at the extreme end of the hub, as shown by the drawing, a circular extension is formed and pro,- vided with an annular recess defining a head 11, this extension being provided for engagement with a brace detachably and rotatively mounted on the extension. This brace forms no part of this invention and is not shown on the drawing.

The member 8 has three radial recesses, provided on the under side for registration with the slots formed in the web portions of the frame and is bored to accommodate dowels 12 which have screw threaded engagement with the upper annular portion of the frame. A cap 13 is provided to closely engage the driving member 8 and this cap has apertures to register with the radial recesses and bores. The dowels pass through the depending flange of the cap into the bores provided therefor in the driving member. The apertures 14 in the depending flange portion of the cap which register with the radial recesses of the member 8 conform to the shape of lateral extensions 15 on three cutter blades 16 the upper ends of which are positioned in the radial recesses in the drive connection member, the upper end of the cutter blades being so proportioned with respect to the radial recesses as to enable the blades to be brought into engagement with the driving member and cap 'by a swinging motion. The cutter blades 16 by reason of the upper end engagement within the apertures of the cap are thus held in assembled relation with the drive connection of the tool when this assembly is removed from the frame.

The cutters 16 are arranged at an angle with respect to the longitudinal axis of the device and have parts of the cutter blades engaging within the grooves and slots of the frame and engaged also with the drive connection member. If it becomes necessary to sharpen the cutters, the dowel may be removed, the blades may be forced from the slots and the whole driving connection and cutter holding means may be removed from the frame. By reason of the engagement with the drive connection member at the upper end the lower annular portion of the frame and the slotted webs, the cutters are supported through out their entire length rigidly but without strain at any one point of the cutters.

The tool is assembled by inserting the combined driving connection and cutter holding means with the cutters'assembled therewith into the frame with the cutter blades seated in the groove and slot formed in the Web portions of the frame. The lower ends of the cutters are conformed to the groove in the lower annular member to give support at this point and to allow for the cutting function of the cutter blades throughout their entire length within the frame. After the insertion of the cutter assembly within the frame the dowels are inserted and by reason of the tight fit of the dowels with the combined driving connection and cutter holding means, the tool is brought into a rigid assembly.

In operation of the device connection is made with respect to either a power drive or a hand driven means, the pipe or the like to be chamfered is inserted within the larger end of the frame and the tool is rotated or the stock is rotated with respect to the tool. It is obvious from the foregoing description that pipes or the like of various diameters may be accommodated within the diverging cutters of the tool giving the single tool a large effective operating range.

The features of the invention are susceptible of many modifications with respect to structural details which will suggest themselves to those skilled in the art and it is desired accordingly that the appended claims be construed broadly commensurate with the scope of the invention, without limitation to the specific features of construction described hereinabove.

I claim as my invention.

1. In a chamfering tool, an annular tapered frame comprising two spaced annular portions and a plurality of webs connecting said portions, a drive member within one end of the frame, an apertured cap member having 2. depending apertured flange surrounding said drive member, a plurality of cutters angularly disposed in said frame, and provided with hook extensions engaging within the apertured cap flange and drive member whereby the drive member cap and cutters constitute a unit assembly within the frame.

2. In a chamfering tool, a circular metal driving member having radial recesses and radial bores, a cap mounted over said member having a depending flange apertured in registry with the recesses and bores of the member, cutter blades having ends engaging within the recesses and apertures of the cap, a spider frame including spaced annular portions and connecting slotted webs to receive said cutter blades, and dowels having threaded connection with the frame and extending into the radial bores of the driving member to hold the tool in assembled relation.

3. In a chamfering tool, a circular metal driving member having radial recesses and radial bores, cutter blades having ends engaging within the recesses, means cooperating with the blades and driving member for holding the blade ends in position in the recesses of the driving member, I

WILLIAM HERMAN THIES. 

